How do I delete a foreign key in SQLAlchemy?
- by Travis
I'm using SQLAlchemy Migrate to keep track of database changes and I'm running into an issue with removing a foreign key. I have two tables, t_new is a new table, and t_exists is an existing table. I need to add t_new, then add a foreign key to t_exists. Then I need to be able to reverse the operation (which is where I'm having trouble).
t_new = sa.Table("new", meta.metadata,
sa.Column("new_id", sa.types.Integer, primary_key=True)
)
t_exists = sa.Table("exists", meta.metadata,
sa.Column("exists_id", sa.types.Integer, primary_key=True),
sa.Column(
"new_id",
sa.types.Integer,
sa.ForeignKey("new.new_id", onupdate="CASCADE", ondelete="CASCADE"),
nullable=False
)
)
This works fine:
t_new.create()
t_exists.c.new_id.create()
But this does not:
t_exists.c.new_id.drop()
t_new.drop()
Trying to drop the foreign key column gives an error: 1025, "Error on rename of '.\my_db_name\#sql-1b0_2e6' to '.\my_db_name\exists' (errno: 150)"
If I do this with raw SQL, i can remove the foreign key manually then remove the column, but I haven't been able to figure out how to remove the foreign key with SQLAlchemy? How can I remove the foreign key, and then the column?
